Does creatine supplementation improve cognitive function?
Moderate EvidenceIT DEPENDS
Moderate evidence suggests creatine may improve short-term memory and reasoning ability, particularly under conditions of sleep deprivation or cognitive stress. Effects in well-rested, healthy adults are smaller and less consistent.
The Verdict
Moderate evidence suggests creatine may improve short-term memory and reasoning ability, particularly under conditions of sleep deprivation or cognitive stress. Effects in well-rested, healthy adults are smaller and less consistent.
What the Evidence Shows
Creatine serves as an energy buffer in the brain, replenishing ATP during demanding cognitive tasks. Multiple RCTs show measurable improvements in working memory and processing speed, especially when participants are sleep-deprived or mentally fatigued. However, studies in well-rested young adults show mixed results, with some finding no significant effect. The most consistent benefits appear in vegetarians (who have lower baseline brain creatine) and older adults.
Evidence Quality
3
Meta-Analyses
12
RCTs
5
Observational
Important Caveats
- ⚠️ Most positive studies used 5g/day for at least 5 days (loading) or 4+ weeks
- ⚠️ Benefits are most pronounced in vegetarians and under sleep deprivation
- ⚠️ Long-term cognitive effects (>6 months) are understudied
- ⚠️ Studies primarily conducted in young adults aged 18-35
Population Studied
Primarily healthy adults aged 18-45, with stronger effects in vegetarians and sleep-deprived individuals
Dosage
Most studies used 5g/day (maintenance) or 20g/day for 5-7 days (loading phase)
Duration
Acute effects seen after 5-7 day loading; chronic studies ranged from 4 weeks to 6 months
Supporting Studies (3)
Effects of creatine supplementation on cognitive function: a systematic review and meta-analysis
Meta-AnalysisAvgerinos KI, Spyrou N, Bougioukas KI, et al. · Experimental Gerontology (2018)
Creatine supplementation improved short-term memory and reasoning/intelligence, with larger effects in older adults and stressed individuals.
View paper (DOI) →Creatine supplementation and brain health
Systematic ReviewRoschel H, Gualano B, Ostojic SM, et al. · Nutrients (2021)
Creatine supplementation shows promise for cognitive function, particularly under conditions that deplete brain creatine stores such as sleep deprivation and mental fatigue.
View paper (DOI) →The influence of creatine supplementation on the cognitive functioning of vegetarians and omnivores
RCTBenton D, Donohoe R. · British Journal of Nutrition (2011)
Vegetarians showed significant improvement in memory after creatine supplementation compared to omnivores, suggesting baseline creatine status modulates effects.
View paper (DOI) →Contradicting Studies (1)
Creatine supplementation does not enhance cognitive function in young healthy adults
RCTRawson ES, Lieberman HR, et al. · Physiology & Behavior (2008)
No significant improvement in cognitive tasks after 6 weeks of 5g/day creatine in well-rested university students.
Why this disagrees:
Participants were well-rested, young, non-vegetarian — all factors that reduce creatine's cognitive impact due to already-sufficient brain creatine levels.
Related Claims
Does lion's mane mushroom improve memory and cognition?
Weak EvidenceWeak evidence suggests lion's mane (Hericium erinaceus) may support nerve growth factor production and show modest cognitive benefits in elderly with mild cognitive impairment, but human evidence is very limited.
Does magnesium supplementation improve sleep quality?
Moderate EvidenceModerate evidence suggests magnesium supplementation may improve sleep quality, particularly in older adults and those with low magnesium intake. Effects include reduced time to fall asleep and improved subjective sleep quality.
Is creatine safe for long-term use?
Strong EvidenceCreatine monohydrate is one of the most extensively studied sports supplements. Decades of research in healthy adults show no evidence of kidney, liver, or cardiovascular harm at recommended doses.